Advantages: Produces a voltage as long as it is supplied with fuel/hydrogen and oxygen/air., The only product is water, which is not agreenhouse gas.  The only product is water, which is not a greenhouse gas., It does not need recharging using mains electricity (unlike a battery)., It has no moving parts (unlike a petrol or diesel engine), It is quieter than a petrol or diesel engine., It fits into an engine bay., Disadvantages: Hydrogen must be stored in the car., Fuel/hydrogen will run out/needreplacing. Fuel/hydrogen will run out/need replacing. , There are few hydrogen stations for refuelling (unlike electrical outlets to recharge a battery)., If the hydrogen is manufactured from coal or natural gas, carbon dioxide is produced and this is a greenhouse gas., Uses platinum electrodes, which are expensive.,

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